I have a Sharp Al 1566 Photocopier,Printer,Scanner
H4-00 = Low heat roller temperature detection. This is usually caused by either a blown heat lamp or a blown thermal fuse.
Sometimes the error can show up for no particular reason. Try resetting using the following sequence:
#,*,C,* (hash, star, clear, star) then enter '14' and then press the start button.
The machine will reboot. If the code comes back you'll need to check the lamp and fuse for continuity (having removed the fuser from the machine first!)
Hope this helps.
on Sep 20, 2019